Airbag control unit with part number 77960-TEA-Q820-M4

What does the airbag control unit 77960-TEA-Q820-M4 do?

The airbag control unit 77960-TEA-Q820-M4 is the switching hub of the restraint system (SRS) of Honda. It processes the crash sensors, selects within milliseconds which airbags and seatbelt pretensioners to trigger in an impact, and checks the system continuously. It shows faults found via the airbag warning light.

The checks cover firing circuits, sensor lines and the supply voltage. They run in the background while the ignition is switched on.

After an accident, the control unit stores crash data and locks itself. The data remains stored in the unit.

Why does the control unit 77960-TEA-Q820-M4 fail?

Stored crash data is the most common cause of a fault with the 77960-TEA-Q820-M4, even if no airbag was triggered. Other causes are ageing electronic components, cold solder joints, moisture and corrosion at plug connectors, and voltage spikes.

A standard diagnostic tool cannot remove the crash data. Airbag24 deletes it during the repair.

Electronics age, and solder joints can go cold or break over time.

Plug connectors with moisture or corrosion transmit signals less well. Voltage spikes, for example from a weak battery or a jump start, put additional strain on the electronics.

How can you tell that the 77960-TEA-Q820-M4 is defective?

The airbag warning light in the instrument cluster lights up permanently or intermittently, a fault message appears, or the diagnostic tool cannot reach the control unit. The fault memory cannot be cleared in this case. In an emergency, airbags and seatbelt pretensioners may then fail to trigger.

The light is the clearest sign of a fault. Have the system checked promptly once it lights up.

A fault message in the instrument cluster is also one of the signs you should not ignore.

Which vehicles is the 77960-TEA-Q820-M4 fitted in?

The control unit 77960-TEA-Q820-M4 is fitted in these vehicles: Honda Civic 10th generation (2015-2022).

Here you will find the vehicles to which Airbag24 assigns this control unit.

• Honda Civic 10th generation (2015-2022)

Compare the part number on the label of the removed unit with this page. This only ensures that it is the right unit. Whether the control unit is defective or a plug or cable is the cause is shown only by the fault memory read out beforehand.

For the same vehicles, we also repair control units with the part numbers 77960-SMG-G014-M1, 77960-TBA-A01, 77960-TBA-A02, 77960-TBA-A03, 77960-TBA-A04, 77960-TBA-A05.

How does the repair of the 77960-TEA-Q820-M4 work?

You first have the fault memory read out and attach the log. Then you disconnect the battery and remove the control unit 77960-TEA-Q820-M4. Afterwards, you create a repair order online and send the well-packed 77960-TEA-Q820-M4 in.

At Airbag24, the unit is examined on the test bench, defective components are replaced, the crash data is deleted and a function test is carried out. Afterwards, your own unit is returned to you.

This processing at Airbag24 usually takes 3–4 working days.

Our repairs come with 2 years' statutory liability for defects.

The repaired control unit comes back with all vehicle data and is ready for use as soon as it is refitted — no coding or programming is required.

How does the control unit 77960-TEA-Q820-M4 get to Airbag24?

You can send the 77960-TEA-Q820-M4 in as a parcel, or book a UPS collection for an extra charge. Airbag24 sends the unit back to you by UPS after the repair.

Put the printed repair order in the parcel and pack the control unit shockproof.